The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 02, 1977
Filed:
Oct. 09, 1975
Applicant:
Inventors:
Shizumasa Kijima, Tokyo, JA;
Isao Yamatsu, Tokyo, JA;
Kimio Hamamura, Kashiwa, JA;
Norio Minami, Kawasaki, JA;
Youji Yamagishi, Tokyo, JA;
Yuichi Inai, Tokyo, JA;
Assignee:
Eisai Co., Ltd., Tokyo, JA;
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
2604 / ; 2606 / ;
Abstract
2,3-DIMETHOXY-5-SUBSTITUTED-6-METHYL-1,4-BENZOHYDROQUINONE OR 1-MONOESTER THEREOF IS PREPARED BY REACTING 2,3-DIMETHOXY-6-METHYL-1,4-BENZOHYDROQUINONE OR 1-MONOACYLESTER THEREOF WITH PRENOL, ISOPRENOL OR DERIVATIVES THEREOF IN THE PRESENCE OF AN ACIDIC CATALYST FOR CONDENSATION WHICH IS ADSORBED ON AN ADSORBENT. This obtained compound is easily converted to quinone compounds which produces many clinical effects in medical and pharmaceutical uses.